Attachment for flexible reel-covers



L. s GUNDERMAN.

ATTACHMENT FOR FLEXIBLE REEL COVERS- I APPLICATION FILED DEC. 3|| I920. 1 ,3 17 Patented Aug. 9, 1921,

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WITNESSES //v VENTOR @FEQE.

LESTER S. G-UNDERTIIAN, OF PITTSBURGH, PENNSYLVANIA.

ATTACHMENT FOB FLEXFBLE REEL-COVERS.

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Application filed December 31, 1920.

T 0 all a; 7mm it may concern Be it known that I, Lnsrnn S. Gunman- MAN, a citizen of the United States, and a resident of littsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful improvement in Attachments for Flexible Reel-Covers, of which the following is a specification.

This invention relates to means of attaching flexible covers to reels, pulleys, and the like. More particularly it relates to means for attaching a flexible cover to the winding drum of a moving picture reel.

The objects of the invention are to pro vide means for attaching a rubber cover to drums, reels, or the in such manner hat the ends of the cover mil lie flat upon the reel, in close contact with each other, and when power is applied through the cover, the ends thereof will not buckle up and form a ridge or other rough sauce upon the surface of the drum.

Although this invention is adapted form ofrubber cover for wind' 'lr lilm These covers are now ma; used extensively, but there has means yet devised, so far as I am aware. for attaching them to the reels in such manner that they will not buc e out at the ends.

Referring to the orawings Figure 1 is a central section through a moving picture reel at right angles to toe axis thereof; Fig. 2- is a plan view of such a reel, a portion of the fiexible cover being broken away; and Fig. 3 is a partial view of one of the flexible covers for such reels.

Moving picture reels comprise a central drum member 1, to the ends of which are attached two wide flanges 2, for the purpose of guiding and holding the film when it is wound upon the reel. Formerly it was the custom to fasten the end of a film which was about to be wound upon such a reel to the drum by means of a spring clampf This required material amount of time, comparatively speaking, and was of some difficulty since the hand of the operator had to be extended between the flanges, and the central part of the reel, while the other hand was used to hold and carefully position the end of the reel in the spring clamp.

Then someone invented a flexible rubber cover for the drum of such reels, such cover having a series of lugs 3 positioned at the Specification of Letters Patent.

fiatented Aug. El, 1321.

Serial No. 434,328.

sides of the flexible cover 4:, as illustrated in Figs. 1, and Such a cover proved highly efiicient. since when it was used it was only necessary to introduce the end of the film into the reel, *ithout adjustment, at any part of the periphery of the reel, and the lugs 3 would engage in the perforations that are provided along the edges of standard films. The film would then wind upon the reel when the latter was rotated. and no particular adjustment or other holding means was necessary. Furthermore, the small lugs 3 being resilient there was no danger of tearing bllQ film. In short, this invention proved very valuable, and a complete success so far as the use of flexible cover and flexible lugs concerned.

However, it has been found very difficult to provide an efiicien and cheap fastening means for holding the rubber member upon the (,U um. To form a cement union between these parts is expensive and troublesome, since the cemented rubber wears out it is very diflicult to remove and renew that part, and there are other objections. Various forms of interior lugs have been provided on the rubber, engaging slots or looking peripheries in the drum, but it has been found that with these after the rubber cover has been used, for a while its ends are disposed to pull out. or turn up, thus for ing a rough place, or ridge on the surface of the drum, which is undesirable.

The present invention consists in providing flush with the ends of the rubber cover 4 interior rib members 5, which are fastened to the rubber strip L, at its ends on their inside faces. The ribs 5 extend entirely across the end of the strip i, and have their outer edges flush with the end of the strip l. This is very important. The edge a of the fastening member 5, that is the one opposite to the point of engagement with the strip 4: is parallel to the surface of the cover strip, whereas, the interior side I) of the member 5 is undercut. The outer side 0, that is the one flush with the end of the cover l, lies in the same plane as the end of the cover l, as clearly illustrated in Figs. 1 and 3.

In fastening the rubber cover 4 011 the drum, when the ends thereof are equipped with my fastening members 5, one end of the cover is placed in position with its lug 5 projecting into a slot 7 which is provided in the drum. Then the other end of the cover is brought around to the slot and the each other in such form that any tangential tension on the rubber cover cannot pull the end of the rubber strip away from the drum, and so the ends thereof are held in firm contact and closely against the drum at all times. In order to release the cover it is only necesary to pull out the end of the strip in a radial direction, thus overcoming the resiliency of the latter, distorting the fastening ribs 5, until the one being pulled comes out of the slot. Such reels ordinarily have lateral openings 8 for engagement with a winding device, as is well known.

I claim:

1. The combination with a winding drum and a flexible cover therefor, of a slot in the periphery of the drum, and transverse rearwardly undercut elastic ribs attached to the inner side of the flexible cover at its ends, said ribs being adapted to extend through the slot in the periphery of the drum into the interior thereof, the breadth of the two ribs taken together being greater than that of the slot.

2. In a pulley comprising a winding drum and having a flexible cover therefor, fastening means for the flexible cover comprising a slot in the periphery of the drum, flexible ribs fastened on the underside of the ends of the flexible cover, said ribs being adapted to extend through the slot in the periphery of the drum, and having rearwardundercutfaces adapted to engage the edges of said slot, the breadth of the two ribs taken together being greater than that of the slot. I

3. The combination with a rubber cover adapted to be Wound upon a hollow drum having a slot in its periphery, of resilient fastening members attached to the ends of the cover, said fastening means comprising transverse members fastened across the inside of the ends of the flexible member and flush therewith, having an undercut rearward side opposite the side which is flush with the ends of the flexible member, the breadth of the two sides a of the transverse members taken together being greater than side, the side flush with the ends of the cover strip being in the same plane therewith, whereby when the ends of the strip are brought together the two ribs form a dovetail inner extension adapted to -.be retained by a slot in a winding drum.

In testimony whereof, I

set my hand. 1 V

LESTER S. GUNDER-MAN. Witnesses c I Jos. BAILEY BROWN,

EDWIN O. J OHNS.

have j hereunto 

